2640994 has 8 divisors (see below), whose sum is σ = 4015980. Its totient is φ = 1302336.

The previous prime is 2640973. The next prime is 2640997. The reversal of 2640994 is 4990462.

It can be written as a sum of positive squares in 2 ways, for example, as 2442969 + 198025 = 1563^2 + 445^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 2²¹ + 6⁷ + 4⁵ + 0 + 9 + 9³ + 4⁹ .

It is not an unprimeable number, because it can be changed into a prime (2640997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8899 + ... + 9190.

2^2640994 is an apocalyptic number.

2640994 is a deficient number, since it is larger than the sum of its proper divisors (1374986).

2640994 is a wasteful number, since it uses less digits than its factorization.

2640994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18164.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 2640994 is about 1625.1135344954. The cubic root of 2640994 is about 138.2258082840.

The spelling of 2640994 in words is "two million, six hundred forty thousand, nine hundred ninety-four".